Level of Effort (LOE)
Work which doesn't yield a final
product. Examples: coordination, follow-up and other support activities.

Milestone
An important event.

Time Now
or Current Date Line
A vertical line showing the date on which the
status of the project was last done. Often this date is the same as the
current date.
If a task is on schedule, it will usually be shaded up to
the time now line. If it is ahead of schedule it will be shaded beyond
the time now line. If it is behind schedule the shading will not reach
the time now line.